Download E-books Programming Ruby 1.9 & 2.0: The Pragmatic Programmers' Guide (The Facets of Ruby) PDF

By Dave Thomas, Chad Fowler

Ruby is the quickest becoming and most enjoyable dynamic language available in the market. if you want to get operating courses brought quickly, you have to upload Ruby for your toolbox.

This ebook is the one whole reference for either Ruby 1.9 and Ruby 2.0, the very most modern model of Ruby.

2013 marks the 20 th anniversary of the Ruby language. we are proud that all through its historical past, we've got endured to hide the newest model of Ruby.

Would you love to head from first concept to operating code a lot, a lot swifter? Do you now spend extra time gratifying the compiler rather than your consumers or finish clients? Are you pissed off with difficult languages that appear to get on your means, rather than getting the paintings performed? Are you utilizing Rails, and need to dig deeper into the underlying Ruby language? if this is the case, then we now have a language and ebook for you!

Ruby is a completely object-oriented language, very similar to the vintage object-oriented language, Smalltalk. Like Smalltalk, it truly is dynamically typed (as against Java or C++), yet in contrast to Smalltalk, Ruby positive factors an analogous conveniences present in sleek scripting languages equivalent to Perl and Python.

The blend of the facility of a natural object-oriented language with the benefit of a scripting language makes Ruby a favourite device of clever, forward-thinking programmers.

The Pickaxe comprises 4 significant sections:

An acclaimed instructional on utilizing Ruby. The definitive connection with the language. entire documentation of all integrated sessions, modules, and methods. entire descriptions of all ninety seven commonplace libraries.

This is the reference handbook for Ruby, together with an outline of all of the normal library modules, a whole connection with all integrated periods and modules (including the entire new and altered equipment brought by way of Ruby 1.9, 1.9.2, 1.9.3, and 2.0). it's also all of the new and adjusted syntax and semantics brought on the grounds that Ruby 1.8. find out about the recent parameter passing principles, neighborhood variable scoping in blocks, fibers, and the recent block statement syntax, between different intriguing new features.

About Ruby 2.0

Ruby 2.0 is a minor replace to Ruby 1.9, not like the extra significant updates from Ruby 1.8 to Ruby 1.9.

The significant language alterations in Ruby 2.0 are the addition of key-phrase arguments and the switch to exploit UTF-8 because the default resource dossier encoding.

There are a few additions to the normal library, including:

@Enumerator::Lazy@, which provides aid for lazy entry to almost certainly limitless lists. Refinements let you encapsulate alterations to third-party periods, and scope their software to person resource records, combating your alterations from polluting the worldwide application.

You'll additionally locate that Ruby 2 is quicker, and has reminiscence administration advancements that make it extra server-friendly.

All advised, there are over a hundred and ten sections of the e-book which have been flagged and cross-linked to point 2.0 content.

What You Need

This e-book assumes you have got a simple knowing of object-oriented programming.

usually, Ruby programmers are inclined to desire the the command line for working their code, and so they are inclined to use textual content editors instead of IDEs.

* Ruby runs on home windows, Linux, and Macs.

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Read or Download Programming Ruby 1.9 & 2.0: The Pragmatic Programmers' Guide (The Facets of Ruby) PDF

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That indicates how example variables work—they’re kept with each one item and on hand to all of the example equipment of these items. three. 1 items and Attributes The BookInStock items we’ve created to this point have an inner kingdom (the ISBN and price). That kingdom is deepest to these objects—no different item can entry an object’s example variables. as a rule, this can be a great thing. It signifies that the article is just accountable for keeping its personal consistency. even though, an item that's absolutely secretive is lovely useless—you can create it, yet then you definately can’t do something with it. You’ll regularly outline equipment that allow you to entry and manage the country of an item, permitting the skin international to engage with the article. those externally obvious elements of an item are known as its attributes. For our BookInStock items, first thing we might have is the facility to determine the ISBN and cost (so we will be able to count number every one designated publication and practice cost calculations). a technique of doing that's to put in writing accessor tools: category BookInStock def initialize(isbn, cost) @isbn = isbn @price = Float(price) finish def isbn @isbn finish obtain from Wow! book document erratum • talk about Objects and Attributes • 33 def expense @price finish # .. finish ebook = BookInStock. new("isbn1", 12. 34) places "ISBN = #{book. isbn}" places "Price = #{book. price}" produces: ISBN cost = isbn1 = 12. 34 right here we’ve outlined accessor how you can go back the values of the 2 example variables. the strategy isbn, for instance, returns the price of the example variable @isbn (because the very last thing finished within the approach is the expression that easily evaluates the @isbn variable). simply because writing accessor equipment is any such universal idiom, Ruby presents a handy shortcut. attr_reader creates those characteristic reader equipment for you: category BookInStock attr_reader :isbn, :price def initialize(isbn, expense) @isbn = isbn @price = Float(price) finish # .. finish publication = BookInStock. new("isbn1", 12. 34) places "ISBN = #{book. isbn}" places "Price = #{book. price}" produces: ISBN cost = isbn1 = 12. 34 this is often the 1st time we’ve used symbols during this bankruptcy. As we mentioned on web page 21, symbols are only a handy method of referencing a reputation. during this code, you could reflect on :isbn as which means the identify isbn and reflect on simple isbn as which means the worth of the variable. during this instance, we named the accessor equipment isbn and value. The corresponding example variables are @isbn and @price. those accessor tools are just like those we wrote through hand prior. There’s a standard false impression, really between those who come from languages similar to Java and C#, that the attr_reader assertion someway publicizes example variables. It doesn’t. It creates the accessor equipment, however the variables themselves don’t have to be declared —they simply pop into life for those who use them. Ruby thoroughly decouples example variables and accessor equipment, as we’ll see in digital Attributes, on web page 35. obtain from Wow! e-book

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